[GHC] #7961: Remove restrictions on promoting GADT's

[GHC]

#7961: Remove restrictions on promoting GADT's
-------------------------------------+-------------------------------------
        Reporter:  danharaj          |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.6.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #6024             |                Blocking:
                                     |  Differential Revisions:  Phab:D808
-------------------------------------+-------------------------------------
Changes (by goldfire):

 * differential:   => Phab:D808


Comment:

 I have posted an early version of my patch to implement kind equalities,
 fixing this ticket. Comments/experimentation welcome. It is easiest to
 access the branch from https://github.com/goldfirere/ghc, on the `nokinds`
 branch.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7961#comment:17>
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